Chap. XI. 



OF REPRODUCTION AND VARIATION. 



391 



and from the sterility of the intermediate form. Nevertheless such cases 

 as nectarines suddenly appearing on peach-trees, occasionally with the 

 fruit half-and-half in nature, — moss-roses appearing on other roses, with 

 the flowers divided into halves, or striped with different colours,— and 

 other such cases, are closely analogous in the result produced, though not 

 in origin, with the case of 0. adami. 



A distinguished botanist, Mr. G. H. Thwaites, 96 has recorded a re- 

 markable case of a seed from Fuchsia coccinea fertilised by F. fulgens, 

 which contained two embryos, and was " a true vegetable twin." The 

 two plants produced from the two embryos were " extremely different in 

 appearance and character," though both resembled other hybrids of the 

 same parentage produced at the same time. These twin plants "were 

 " closely coherent, below the two pairs of cotyledon-leaves, into a single 

 " cylindrical stem, so that they had subsequently the appearance of being 

 " branches on one trunk." Had the two united stems grown up to their 

 Ml height, instead of dying, a curiously mixed hybrid would have been 

 produced ; but even if some of the buds had subsequently reverted to 

 both parent-forms, the case, although more complex, would not have been 

 strictly analogous with that of 0. adami. On the other hand, a mongrel 

 melon described by Sageret 97 perhaps did thus originate ; for the two mam 

 branches, which arose from two cotyledon-buds, produced very different 

 fruition the one branch like that of the paternal variety, and on the 

 other branch to a certain extent like that of the maternal variety, the 

 melon of China. 



The famous bizzarria Orange offers a strictly parallel case to that ol 

 Cytisus adami. The gardener who in 1644 in Florence raised this tree, 

 declared that it was a seedling which had been grafted; and after the 

 graft had perished, the stock sprouted and produced the bizzarria 

 Gallesio, who carefully examined several living specimens and compared 

 them with the description given by the original describer P. Nato, 98 states 

 that the tree produces at the same time leaves, flowers, and fruit identical 

 with the bitter orange and with the citron of Florence, and likewise 

 compound fruit with the two kinds either blended together, both extern- 

 ally and internally, or segregated in various ways. This tree can be pro- 

 pagated by cuttings, and retains its diversified character. The so-called 

 trifacial orange of Alexandria and Smyrna 99 resembles m its general 

 nature the bizzarria, but differs from it in the sweet orange and citron being 

 blended together in the same fruit, and separately produced on the same 

 tree : nothing is known of its origin. In regard to the bizzarria, many 

 authors believe that it is a graft-hybrid; Gallesio on the other hand 

 thinks that it is an ordinary hybrid, with the habit of partially reverting 



96 ' Annals and Mag. of Nat. Hist.,' 

 March 1848. 



97 ' Pomologie Physiolog.,' 1830, p. 

 126. 



98 Gallesio, ' Gli Agrumi dei Giard. 

 Bot. Agrar. di Firenze,' 1839, p. 11. In 

 his ' Traite du Citrus,' 1811, p. 146. he 



speaks as if the compound fruit con- 

 sisted in part of lemons, but this appa- 

 rently was a mistake. 



99 ' Gard. Chron.,' 1855, p. 628. See 

 also Prof. Caspary, in ' Transact. Hort. 

 Congress of Amsterdam,' 1865. 



